Win the Samuel Johnson Prize shortlist

The shortlist for this year's BBC Four Samuel Johnson Prize comprises six of the best non-fiction books published in the last 12 months.

The books are: Samuel Pepys: The Unequalled Self by Claire Tomalin Pushkin by TJ Binyon Natasha's Dance: A Cultural History of Russia by Orlando Figes The Devil That Danced on the Water by Aminatta Forna Nelson: Love and Fame by Edgar Vincent and Dr Tatiana's Sex Advice To All Creation: The Definitive Guide to the Evolutionary Biology of Sex by Olivia Judson.

We have two sets of the shortlisted books to give away, signed by the authors. For the chance to win, email your answer to the question below to books.competition@guardianunlimited.co.uk by noon on Wednesday June 11, with your name and address, marking your subject heading 'Samuel Johnson Prize'.